I've spent the last week feasting on John Martyn via Spotify. He was a gap in my musical education. He turns out, as a large portion of you reading already well know, to be a rich, raw talent. I knew his rep but had a misguided notion he was another blueprint for whiny contemporary singer-songwriters. All that reveals is my own ignorance.

John Martyn, Heaven And Earth

Two years after his death, the final recordings by the ground-breaking Glaswegian are released.

Although now regularly cited as an influence by many (and audibly so), it is over three decades since Martyn's career was at a peak, but technology has since made copying his technical innovations possible, and his vocal range –from light-voiced yearning to blues growl– is the aim of many.

Live At Leeds may unsettle latter-day fans of John Martyn who have belatedly discovered the great man via the tasteful posthumous compilation.